Metservice has issued another severe weather warning for the Coromandel Peninsula and Bay of Plenty this morning.

A low over the Tasman Sea extends a slow-moving trough over northern New Zealand, with periods of rain to continue in the northeast of the North Island today.

On Friday, rain is expected to become heavy through the Coromandel and Bay of Plenty, before easing during Saturday.

However, MetService warns 100-150mm of rain may accumulate on top of what has already fallen over the last few days.

'Periods of rain continue in the northeast of the North Island today, Rainfall in these areas can produce flash flooding and cause rivers and streams to rise rapidly. It can also lead to hazardous driving conditions.”

COROMANDEL FORECAST

Periods of rain are expected to continue through today, before becoming heavy again Friday morning. In the 21 hours from midday Friday to 9am Saturday, a further 120 to 140mm may accumulate on top of what has already fallen over the last few days. Peak intensities 25mm per hour or possibly more in thunderstorms. Further heavy rain is likely late Saturday and Sunday.

WESTERN BAY OF PLENTY FORECAST

Rain is expected to become heavy Friday afternoon. In the 18 hours from 3pm Friday to 9am Saturday, 120 to 140mm may accumulate on top of what has already fallen over the last few days. Peak intensities 25mm per hour or possibly more in thunderstorms. Further heavy rain is likely late Saturday and Sunday.

WHAKATANE AND EASTERN BAY OF PLENTY FORECAST:

Rain is expected to become heavy Friday night. In the 15 hours from 9pm Friday to midday Saturday, 100 to 120mm may accumulate. Peak intensities 25mm per hour or possibly more in thunderstorms. Further heavy rain is likely late Saturday and Sunday.

COROMANDEL ROADS UPDATE:

State Highway 25 between Kopu and Thames is now open.

State Highway 25 at Whiritoa is closed because of slips.

State Highway 25 Between Onemana and Whangamata is closed because of flooding.

State Highway 25 Between Hikuai and Tairua is NOW OPEN, contractors are monitoring the area, please drive with caution.

State Highway 25 from Kereta to Te Kouma take care because of slips.

Tapu-Coroglen Road is closed - slips and flooding, contractor working on the road.

MetService's rain radar, as seen at 10.21am. Image: MetService